You should always use the first urine of the day especially if you aren't that far along
First morning urine is what you should use in early pregnancy as urine during the day is diluted. If I were you I'd take a retest and take it in the morning as the result will be more reliable.
I didn't get a positive urine test till 14 weeks
The doc is the best way to confirm at this point
It is rare to get a false positive but common to get a negative and be pregnant. Go see your Dr and have them test through your blood.
Your best bet is to get a blood test done